wireless communication terminals and modems, cellular and cordless telephones, and personal communication network (PCN) handsets including RF and IF transceiver circuit assemblies, and analog and digital signal processing circuit assemblies thereof; battery packs for cellular and cordless telephones, and PCN handsets; computer programs for cellular and cordless telephones, and PCN handset processors; cell-site and private branch exchange (PBX) communication modems including RF and IF transceiver circuit assemblies, and analog and digital signal processing circuit assemblies; cell-site, PBX and mobile telephone switching office (MTSO) data processing and switching circuit assemblies, vocoder data selection circuit assemblies; and computer programs for cell-site, PBX and MTSO processors; integrated circuits for spread spectrum modulation, spread spectrum demodulation, error correction encoding, error correction decoding, vocoding and preprogrammed memories containing processor instructions